Quarterly report pursuant to Section 13 or 15(d)

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Noncash stock-based compensation expense
    Three Months Ended September 30,     Nine Months Ended September 30,  
    2019     2018     2019     2018  
Stock options   $ 374,000     $ 512,000     $ 3,004,000     $ 1,741,000  
Warrants     263,000       229,000       1,918,000       682,000  
Restricted stock units     75,000       23,000       311,000       28,000  
Earn-out compensation expense (Note 5)     25,000       -       33,000       -  
Total noncash stock compensation expense   $ 737,000     $ 764,000     $ 5,266,000     $ 2,451,000